When you exit sleep mode or when an incoming call, the screen brightness is at a minimum. The screen brightness changes randomly. It is impossible to make out who is calling. The performance of the phone has decreased. Especially noticeable on demanding games. To become slow. It works poorly, jerky scrolling in the browser and applications. Not hiding the navigation bar in full screen modes. Return the oreo. Android 9 painted sh1t ..., setting the phone's performance. I will write above if you do not correct
